Sleep Stages
Sleep Stages
Sleep stages are recurring phases of distinct brain activity during sleep, divided into non-REM (stages 1–3) and REM sleep.
Details
Sleep is composed of non-REM sleep (N1, N2, N3) and REM sleep, cycling approximately every 90 minutes.
N1 is very light sleep, N2 marks the onset of proper sleep, and N3 is deep slow-wave sleep where physical restoration occurs.
During REM sleep, dreaming takes place along with memory consolidation and emotional processing.
In the first half of the night, deep sleep predominates, while REM sleep increases in the second half.
All sleep stages are important for health, and sufficient high-quality sleep is essential. — Mindy
💡 Real-Life Example
Throughout the night, roughly every 90 minutes, light sleep → deep sleep → REM sleep repeats in a cycle.
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This content is for educational purposes and does not replace professional medical diagnosis.